Of course you cannot contact openings because roller intine is rotating, and steam condensate drains and swivel joint is fixed not generated noise and damage to drainage pipes.

• 当然管口不能接触内壁，因为辊筒是旋转的，而冷凝水排水管和蒸汽旋转接头是固定不动的，否则会产生噪音和损坏排水管。